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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "BroadcastChannelService.h"
#include "BroadcastChannelParent.h"
#include "mozilla/dom/BlobImpl.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/IPCBlobUtils.h"
#include "mozilla/ipc/BackgroundParent.h"
#ifdef XP_WIN
# undef PostMessage
#endif
namespace mozilla {
using namespace ipc;
namespace dom {
namespace {
BroadcastChannelService* sInstance = nullptr;
ClonedMessageData CloneClonedMessageData(const ClonedMessageData& aOther) {
auto cloneData = SerializedStructuredCloneBuffer{};
cloneData.data.initScope(aOther.data().data.scope());
const bool res = cloneData.data.Append(aOther.data().data);
MOZ_RELEASE_ASSERT(res, "out of memory");
return {std::move(cloneData), aOther.blobs(), aOther.inputStreams(),
aOther.identifiers()};
}
MessageData CloneMessageData(const MessageData& aOther) {
switch (aOther.data().type()) {
case MessageDataType::TClonedMessageData:
return {aOther.agentClusterId(),
CloneClonedMessageData(aOther.data().get_ClonedMessageData())};
case MessageDataType::TRefMessageData:
return {aOther.agentClusterId(), aOther.data().get_RefMessageData()};
default:
MOZ_CRASH("Unexpected MessageDataType type");
}
}
} // namespace
BroadcastChannelService::BroadcastChannelService() {
AssertIsOnBackgroundThread();
// sInstance is a raw BroadcastChannelService*.
MOZ_ASSERT(!sInstance);
sInstance = this;
}
BroadcastChannelService::~BroadcastChannelService() {
AssertIsOnBackgroundThread();
MOZ_ASSERT(sInstance == this);
MOZ_ASSERT(mAgents.Count() == 0);
sInstance = nullptr;
}
// static
already_AddRefed<BroadcastChannelService>
BroadcastChannelService::GetOrCreate() {
AssertIsOnBackgroundThread();
RefPtr<BroadcastChannelService> instance = sInstance;
if (!instance) {
instance = new BroadcastChannelService();
}
return instance.forget();
}
void BroadcastChannelService::RegisterActor(
BroadcastChannelParent* aParent, const nsAString& aOriginChannelKey) {
AssertIsOnBackgroundThread();
MOZ_ASSERT(aParent);
const auto& parents = mAgents.LookupForAdd(aOriginChannelKey).OrInsert([]() {
return new nsTArray<BroadcastChannelParent*>();
});
MOZ_ASSERT(!parents->Contains(aParent));
parents->AppendElement(aParent);
}
void BroadcastChannelService::UnregisterActor(
BroadcastChannelParent* aParent, const nsAString& aOriginChannelKey) {
AssertIsOnBackgroundThread();
MOZ_ASSERT(aParent);
if (auto entry = mAgents.Lookup(aOriginChannelKey)) {
entry.Data()->RemoveElement(aParent);
// remove the entry if the array is now empty
if (entry.Data()->IsEmpty()) {
entry.Remove();
}
} else {
MOZ_CRASH("Invalid state");
}
}
void BroadcastChannelService::PostMessage(BroadcastChannelParent* aParent,
const MessageData& aData,
const nsAString& aOriginChannelKey) {
AssertIsOnBackgroundThread();
MOZ_ASSERT(aParent);
nsTArray<BroadcastChannelParent*>* parents;
if (!mAgents.Get(aOriginChannelKey, &parents)) {
MOZ_CRASH("Invalid state");
}
// We need to keep the array alive for the life-time of this operation.
nsTArray<RefPtr<BlobImpl>> blobImpls;
if (aData.data().type() == MessageDataType::TClonedMessageData) {
const nsTArray<IPCBlob>& blobs =
aData.data().get_ClonedMessageData().blobs();
if (!blobs.IsEmpty()) {
blobImpls.SetCapacity(blobs.Length());
for (uint32_t i = 0, len = blobs.Length(); i < len; ++i) {
RefPtr<BlobImpl> impl = IPCBlobUtils::Deserialize(blobs[i]);
MOZ_ASSERT(impl);
blobImpls.AppendElement(impl);
}
}
}
uint32_t selectedActorsOnSamePid = 0;
// For each parent actor, we notify the message.
for (uint32_t i = 0; i < parents->Length(); ++i) {
BroadcastChannelParent* parent = parents->ElementAt(i);
MOZ_ASSERT(parent);
if (parent == aParent) {
continue;
}
if (parent->OtherPid() == aParent->OtherPid()) {
++selectedActorsOnSamePid;
}
// We need to have a copy of the data for this parent.
MessageData newData = CloneMessageData(aData);
MOZ_ASSERT(newData.data().type() == aData.data().type());
if (!blobImpls.IsEmpty()) {
nsTArray<IPCBlob>& newBlobImpls =
newData.data().get_ClonedMessageData().blobs();
MOZ_ASSERT(blobImpls.Length() == newBlobImpls.Length());
// Serialize Blob objects for this message.
for (uint32_t i = 0, len = blobImpls.Length(); i < len; ++i) {
nsresult rv = IPCBlobUtils::Serialize(blobImpls[i], parent->Manager(),
newBlobImpls[i]);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
}
}
Unused << parent->SendNotify(newData);
}
// If this is a refMessageData, we need to know when it can be released.
if (aData.data().type() == MessageDataType::TRefMessageData) {
Unused << aParent->SendRefMessageDelivered(
aData.data().get_RefMessageData().uuid(), selectedActorsOnSamePid);
}
}
} // namespace dom
} // namespace mozilla
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